Buying a replacement battery for a Powerbook G4

Hi all,
It's time to replace the battery on my 1.67 GHz Powerbook, and I'm looking at alternatives to the Apple store. I've been looking at OWC and Newegg for options, and the prices seem reasonable. Is there anything I should be aware of when replacing my battery with a non-Apple branded model?

I'm in exactly the same boat. It's time for me to buy a new battery for my G4 powerbook. I have seen some on ebay for about £35, is it okay to buy from there? Has anyone done so on the forums? It's just that I can't even plug out the adapter and have my mac running for 10 mins before it shuts down anymore...

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